Thus we have shown the equivalence of EPA and TMD factorization formalism.
We would like to emphasis that our main result (REF )
includes corrections beyond the EPA or twist-2. Note that, in principle,
one also needs to consider the Sudakov factor in the TMD factorization
theorem [1]}, [2]}, [3]}, [4]}.
It is still a chanllenge to add the effective Sudakov factor into
our framework, which we reserve for a future study.
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